#define led 7
#define sw 9
int swState;
void setup() {
  // put your setup code here, to run once:
  pinMode(led,OUTPUT);
  pinMode(sw,INPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  swState=digitalRead(sw);
  if(swState==1){
    digitalWrite(led,HIGH);
    delay(500);
  }
  digitalWrite(led,LOW);
 
}